CBR600 dieing problem

Got a strange problem with my '94 CBR600 F2. It dies after riding it for
about 2-3 miles, like it starving for fuel. It will start again after some
time and takes many cranks. It seems to run fine with the choke on full.
Any ideas? Thanks.

 

Your carburetors are all gummed up from evaporating gasoline.

Add 4 or 5 ounces of the non-aerosol Berryman B12 Choke and Carburetor
Cleaner to a full tank of gasoline and ride the bike until the
carburetors are clean.

It wouldn't hurt to replace the fuel filter.

 

If I have a can full of liquid Wynnes carb cleaner (maybe 6-8oz) in half
a tank of gas will that mess up things? I also tried spraying aerosol
carb cleaner into the airbox and it is supposed to slow engine down, but
infact speeded it up.

Ian Singer

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I dunno. What's in Wynnes carb cleaner? Chemicals like acetone,
toluene, methyl alcohol
and xylene are good for dissolving gum and varnish, but stuff vaguely
identified as "petroleum
distillate" is better for lubricating fuel injectors.

 

That depends......on how big the tank is and what the recommended dose is.
RTFI......on the can. 2X the recommended concentration is usually more than
enough.

Typical for many engines that run lean to start with............could be by
design or could be from a vacume leak. Also depends on the volatility of
the cleaner.

 

Yes that's it. Closest to B12 I can get here.

Ian Singer

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The Wynns was 325 ml and as its automotive says add to a tank of gas

The aerosol carb cleaner I sprayed in with the engine running has
xylene, diacetone alcohol, acetone and propane in it. Says will cause
engine to slow but guess the propane combined with the Wynns has
opposite effect. With the angle of the carb throats going into airbox in
KX750-R1 and shooting in from above its hard to get in #1 and #4.
Reluctant to tear down carbs as can never get float valves out without
damage. When I first go to start it it fires once, then dies, then is a
pain to restart.

Ian Singer




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Is there not an instruction for lesser amounts of gas.......like add X ml.
for each gallon?
If not, a little math is in order. Please forgive the mixed systems; I'm
not going to do THAT much math!
325 ml in a car with ~ 15 gallon tank works out to be about 22 ml per
gallon.
So if the bike half tank is ~ 2 gal, twice the std. rate would call for 88
ml.......about 1/4 the can.
Anywhere between 1/4 and 1/2 can should be OK.

 

I puller the tank and looked for bad vacuum hoses but all looked
good....I'll try some carb cleaner see if that helps.

thanks for the help.......

 

I define dirty as being the jets all plugged solid from the gasoline. So
solid you have difficulty trying to ream them out with a wire. Also
causes the float valves to stick in open position. Bottom of bowls does
not fill with sediment but with thick brown slime.

Gas 30 years ago did not used to do that.

Ian Singer

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SeaFoam is mostly oil, which will NOT dissolve the kind of gum and
varnish that accumulates in the ports and passageways of a CV
carburetor.

SeaFoam would be good for rust prevention during storage of an
outboard motor.

 

Maybe, maybe not. SeaFoam is NOT a really good carb cleaner.
Original Gumout or Berryman's B12 are much better.

SeaFoam works for many because they didn't really have a serious problem in
the first place.

 

Won't hurt to try ...

If it keeps dying and you find it has no spark when dead, check
the circuit for Igition Pulse Generator. Took me a
long time to find such problem on an older CBR600
years ago.

P

"I Ain't Blind, I Just Don't Wanna See"
- the title of a tune by Little Joe Blue, maybe 1966

 

Fresh gas has additives designed to clean fuel systems. The additives
evaporate if you let the bike sit unridden for months at a time. Then
the carbs gum up.

 

seafoam is not mostly oil. it does have a good cleaner in it. there are
better cleaners, but it is ok. KB

 

Yes, it is *mostly* "pale oil".

http://209.85.173.104/search?q=cach...+"sea+foam"&hl=en&ct=clnk&cd=4&gl=us&ie=UTF-8

If you consider naphta and isopropyl alcohol to be "good cleaners",
yes, those ingredients are in Sea Foam.

But they will not do what the acetone, toluene and methyl alcohol in
Berryman B12 do.

 

ok interesting. now NAPHTHA is a solvent. the question is is it any better
or worse than "petroleum distillates" which is in most the other cleaners.
I don`t really know??? wish I knew. KB

 

"WE" are trying to tell you. Pay attention and you might learn something.
;-)

 

Naphtha is the first liquid that comes off a distillation column. It's
"white gas" or unreformed gasoline.